1. Reminders on gel formation
1.1 Definition of a gel and criteria for obtaining an aerogel
A gel is a thermodynamically stable solid-liquid two-phase system consisting of a continuous three-dimensional interpenetrating double network, one solid and one liquid. Flory has proposed a classification of gels that applies equally to organic and inorganic gels:
lamellar gels such as mesophase and clay gels;
polymer-type covalently bonded gels ;
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Reminders on gel formation
The different gel families
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